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        <a href="../.." >Promise 对象</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="promise-&#x5BF9;&#x8C61;">Promise &#x5BF9;&#x8C61;</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<p>Promise &#x5BF9;&#x8C61;&#x662F; JavaScript &#x7684;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x89E3;&#x51B3;&#x65B9;&#x6848;&#xFF0C;&#x4E3A;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x63D0;&#x4F9B;&#x7EDF;&#x4E00;&#x63A5;&#x53E3;&#x3002;&#x5B83;&#x8D77;&#x5230;&#x4EE3;&#x7406;&#x4F5C;&#x7528;&#xFF08;proxy&#xFF09;&#xFF0C;&#x5145;&#x5F53;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x4E0E;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4E4B;&#x95F4;&#x7684;&#x4E2D;&#x4ECB;&#xFF0C;&#x4F7F;&#x5F97;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5177;&#x5907;&#x540C;&#x6B65;&#x64CD;&#x4F5C;&#x7684;&#x63A5;&#x53E3;&#x3002;Promise &#x53EF;&#x4EE5;&#x8BA9;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5199;&#x8D77;&#x6765;&#xFF0C;&#x5C31;&#x50CF;&#x5728;&#x5199;&#x540C;&#x6B65;&#x64CD;&#x4F5C;&#x7684;&#x6D41;&#x7A0B;&#xFF0C;&#x800C;&#x4E0D;&#x5FC5;&#x4E00;&#x5C42;&#x5C42;&#x5730;&#x5D4C;&#x5957;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x672C;&#x7AE0;&#x53EA;&#x662F; Promise &#x5BF9;&#x8C61;&#x7684;&#x7B80;&#x5355;&#x4ECB;&#x7ECD;&#x3002;&#x4E3A;&#x4E86;&#x907F;&#x514D;&#x4E0E;&#x540E;&#x7EED;&#x6559;&#x7A0B;&#x7684;&#x91CD;&#x590D;&#xFF0C;&#x66F4;&#x5B8C;&#x6574;&#x7684;&#x4ECB;&#x7ECD;&#x8BF7;&#x770B;<a href="http://es6.ruanyifeng.com/" target="_blank" rel="nofollow">&#x300A;ES6 &#x6807;&#x51C6;&#x5165;&#x95E8;&#x300B;</a>&#x7684;<a href="http://es6.ruanyifeng.com/#docs/promise" target="_blank" rel="nofollow">&#x300A;Promise &#x5BF9;&#x8C61;&#x300B;</a>&#x4E00;&#x7AE0;&#x3002;</p>
<p>&#x9996;&#x5148;&#xFF0C;Promise &#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x4E5F;&#x662F;&#x4E00;&#x4E2A;&#x6784;&#x9020;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">f1</span>(<span class="hljs-params">resolve, reject</span>) </span>{
  <span class="hljs-comment">// &#x5F02;&#x6B65;&#x4EE3;&#x7801;...</span>
}

<span class="hljs-keyword">var</span> p1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(f1);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>Promise</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;<code>f1</code>&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;<code>f1</code>&#x91CC;&#x9762;&#x662F;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x7684;&#x4EE3;&#x7801;&#x3002;&#x7136;&#x540E;&#xFF0C;&#x8FD4;&#x56DE;&#x7684;<code>p1</code>&#x5C31;&#x662F;&#x4E00;&#x4E2A; Promise &#x5B9E;&#x4F8B;&#x3002;</p>
<p>Promise &#x7684;&#x8BBE;&#x8BA1;&#x601D;&#x60F3;&#x662F;&#xFF0C;&#x6240;&#x6709;&#x5F02;&#x6B65;&#x4EFB;&#x52A1;&#x90FD;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A; Promise &#x5B9E;&#x4F8B;&#x3002;Promise &#x5B9E;&#x4F8B;&#x6709;&#x4E00;&#x4E2A;<code>then</code>&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x6765;&#x6307;&#x5B9A;&#x4E0B;&#x4E00;&#x6B65;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> p1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(f1);
p1.then(f2);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>f1</code>&#x7684;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x6267;&#x884C;&#x5B8C;&#x6210;&#xFF0C;&#x5C31;&#x4F1A;&#x6267;&#x884C;<code>f2</code>&#x3002;</p>
<p>&#x4F20;&#x7EDF;&#x7684;&#x5199;&#x6CD5;&#x53EF;&#x80FD;&#x9700;&#x8981;&#x628A;<code>f2</code>&#x4F5C;&#x4E3A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4F20;&#x5165;<code>f1</code>&#xFF0C;&#x6BD4;&#x5982;&#x5199;&#x6210;<code>f1(f2)</code>&#xFF0C;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5B8C;&#x6210;&#x540E;&#xFF0C;&#x5728;<code>f1</code>&#x5185;&#x90E8;&#x8C03;&#x7528;<code>f2</code>&#x3002;Promise &#x4F7F;&#x5F97;<code>f1</code>&#x548C;<code>f2</code>&#x53D8;&#x6210;&#x4E86;&#x94FE;&#x5F0F;&#x5199;&#x6CD5;&#x3002;&#x4E0D;&#x4EC5;&#x6539;&#x5584;&#x4E86;&#x53EF;&#x8BFB;&#x6027;&#xFF0C;&#x800C;&#x4E14;&#x5BF9;&#x4E8E;&#x591A;&#x5C42;&#x5D4C;&#x5957;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x5C24;&#x5176;&#x65B9;&#x4FBF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4F20;&#x7EDF;&#x5199;&#x6CD5;</span>
step1(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">value1</span>) </span>{
  step2(value1, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">value2</span>) </span>{
    step3(value2, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">value3</span>) </span>{
      step4(value3, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">value4</span>) </span>{
        <span class="hljs-comment">// ...</span>
      });
    });
  });
});

<span class="hljs-comment">// Promise &#x7684;&#x5199;&#x6CD5;</span>
(<span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(step1))
  .then(step2)
  .then(step3)
  .then(step4);
</code></pre>
<p>&#x4ECE;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#xFF0C;&#x91C7;&#x7528; Promises &#x4EE5;&#x540E;&#xFF0C;&#x7A0B;&#x5E8F;&#x6D41;&#x7A0B;&#x53D8;&#x5F97;&#x975E;&#x5E38;&#x6E05;&#x695A;&#xFF0C;&#x5341;&#x5206;&#x6613;&#x8BFB;&#x3002;&#x6CE8;&#x610F;&#xFF0C;&#x4E3A;&#x4E86;&#x4FBF;&#x4E8E;&#x7406;&#x89E3;&#xFF0C;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;<code>Promise</code>&#x5B9E;&#x4F8B;&#x7684;&#x751F;&#x6210;&#x683C;&#x5F0F;&#xFF0C;&#x505A;&#x4E86;&#x7B80;&#x5316;&#xFF0C;&#x771F;&#x6B63;&#x7684;&#x8BED;&#x6CD5;&#x8BF7;&#x53C2;&#x7167;&#x4E0B;&#x6587;&#x3002;</p>
<p>&#x603B;&#x7684;&#x6765;&#x8BF4;&#xFF0C;&#x4F20;&#x7EDF;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x5199;&#x6CD5;&#x4F7F;&#x5F97;&#x4EE3;&#x7801;&#x6DF7;&#x6210;&#x4E00;&#x56E2;&#xFF0C;&#x53D8;&#x5F97;&#x6A2A;&#x5411;&#x53D1;&#x5C55;&#x800C;&#x4E0D;&#x662F;&#x5411;&#x4E0B;&#x53D1;&#x5C55;&#x3002;Promise &#x5C31;&#x662F;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x4F7F;&#x5F97;&#x5F02;&#x6B65;&#x6D41;&#x7A0B;&#x53EF;&#x4EE5;&#x5199;&#x6210;&#x540C;&#x6B65;&#x6D41;&#x7A0B;&#x3002;</p>
<p>Promise &#x539F;&#x672C;&#x53EA;&#x662F;&#x793E;&#x533A;&#x63D0;&#x51FA;&#x7684;&#x4E00;&#x4E2A;&#x6784;&#x60F3;&#xFF0C;&#x4E00;&#x4E9B;&#x51FD;&#x6570;&#x5E93;&#x7387;&#x5148;&#x5B9E;&#x73B0;&#x4E86;&#x8FD9;&#x4E2A;&#x529F;&#x80FD;&#x3002;ECMAScript 6 &#x5C06;&#x5176;&#x5199;&#x5165;&#x8BED;&#x8A00;&#x6807;&#x51C6;&#xFF0C;&#x76EE;&#x524D; JavaScript &#x539F;&#x751F;&#x652F;&#x6301; Promise &#x5BF9;&#x8C61;&#x3002;</p>
<h2 id="promise-&#x5BF9;&#x8C61;&#x7684;&#x72B6;&#x6001;">Promise &#x5BF9;&#x8C61;&#x7684;&#x72B6;&#x6001;</h2>
<p>Promise &#x5BF9;&#x8C61;&#x901A;&#x8FC7;&#x81EA;&#x8EAB;&#x7684;&#x72B6;&#x6001;&#xFF0C;&#x6765;&#x63A7;&#x5236;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x3002;Promise &#x5B9E;&#x4F8B;&#x5177;&#x6709;&#x4E09;&#x79CD;&#x72B6;&#x6001;&#x3002;</p>
<ul>
<li>&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x672A;&#x5B8C;&#x6210;&#xFF08;pending&#xFF09;</li>
<li>&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x6210;&#x529F;&#xFF08;fulfilled&#xFF09;</li>
<li>&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5931;&#x8D25;&#xFF08;rejected&#xFF09;</li>
</ul>
<p>&#x4E0A;&#x9762;&#x4E09;&#x79CD;&#x72B6;&#x6001;&#x91CC;&#x9762;&#xFF0C;<code>fulfilled</code>&#x548C;<code>rejected</code>&#x5408;&#x5728;&#x4E00;&#x8D77;&#x79F0;&#x4E3A;<code>resolved</code>&#xFF08;&#x5DF2;&#x5B9A;&#x578B;&#xFF09;&#x3002;</p>
<p>&#x8FD9;&#x4E09;&#x79CD;&#x7684;&#x72B6;&#x6001;&#x7684;&#x53D8;&#x5316;&#x9014;&#x5F84;&#x53EA;&#x6709;&#x4E24;&#x79CD;&#x3002;</p>
<ul>
<li>&#x4ECE;&#x201C;&#x672A;&#x5B8C;&#x6210;&#x201D;&#x5230;&#x201C;&#x6210;&#x529F;&#x201D;</li>
<li>&#x4ECE;&#x201C;&#x672A;&#x5B8C;&#x6210;&#x201D;&#x5230;&#x201C;&#x5931;&#x8D25;&#x201D;</li>
</ul>
<p>&#x4E00;&#x65E6;&#x72B6;&#x6001;&#x53D1;&#x751F;&#x53D8;&#x5316;&#xFF0C;&#x5C31;&#x51DD;&#x56FA;&#x4E86;&#xFF0C;&#x4E0D;&#x4F1A;&#x518D;&#x6709;&#x65B0;&#x7684;&#x72B6;&#x6001;&#x53D8;&#x5316;&#x3002;&#x8FD9;&#x4E5F;&#x662F; Promise &#x8FD9;&#x4E2A;&#x540D;&#x5B57;&#x7684;&#x7531;&#x6765;&#xFF0C;&#x5B83;&#x7684;&#x82F1;&#x8BED;&#x610F;&#x601D;&#x662F;&#x201C;&#x627F;&#x8BFA;&#x201D;&#xFF0C;&#x4E00;&#x65E6;&#x627F;&#x8BFA;&#x6210;&#x6548;&#xFF0C;&#x5C31;&#x4E0D;&#x5F97;&#x518D;&#x6539;&#x53D8;&#x4E86;&#x3002;&#x8FD9;&#x4E5F;&#x610F;&#x5473;&#x7740;&#xFF0C;Promise &#x5B9E;&#x4F8B;&#x7684;&#x72B6;&#x6001;&#x53D8;&#x5316;&#x53EA;&#x53EF;&#x80FD;&#x53D1;&#x751F;&#x4E00;&#x6B21;&#x3002;</p>
<p>&#x56E0;&#x6B64;&#xFF0C;Promise &#x7684;&#x6700;&#x7EC8;&#x7ED3;&#x679C;&#x53EA;&#x6709;&#x4E24;&#x79CD;&#x3002;</p>
<ul>
<li>&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x6210;&#x529F;&#xFF0C;Promise &#x5B9E;&#x4F8B;&#x4F20;&#x56DE;&#x4E00;&#x4E2A;&#x503C;&#xFF08;value&#xFF09;&#xFF0C;&#x72B6;&#x6001;&#x53D8;&#x4E3A;<code>fulfilled</code>&#x3002;</li>
<li>&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5931;&#x8D25;&#xFF0C;Promise &#x5B9E;&#x4F8B;&#x629B;&#x51FA;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;&#xFF08;error&#xFF09;&#xFF0C;&#x72B6;&#x6001;&#x53D8;&#x4E3A;<code>rejected</code>&#x3002;</li>
</ul>
<h2 id="promise-&#x6784;&#x9020;&#x51FD;&#x6570;">Promise &#x6784;&#x9020;&#x51FD;&#x6570;</h2>
<p>JavaScript &#x63D0;&#x4F9B;&#x539F;&#x751F;&#x7684;<code>Promise</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x6765;&#x751F;&#x6210; Promise &#x5B9E;&#x4F8B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> promise = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">resolve, reject</span>) </span>{
  <span class="hljs-comment">// ...</span>

  <span class="hljs-keyword">if</span> (<span class="hljs-comment">/* &#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x6210;&#x529F; */</span>){
    resolve(value);
  } <span class="hljs-keyword">else</span> { <span class="hljs-comment">/* &#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5931;&#x8D25; */</span>
    reject(<span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>());
  }
});
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>Promise</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x7684;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#x5206;&#x522B;&#x662F;<code>resolve</code>&#x548C;<code>reject</code>&#x3002;&#x5B83;&#x4EEC;&#x662F;&#x4E24;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x7531; JavaScript &#x5F15;&#x64CE;&#x63D0;&#x4F9B;&#xFF0C;&#x4E0D;&#x7528;&#x81EA;&#x5DF1;&#x5B9E;&#x73B0;&#x3002;</p>
<p><code>resolve</code>&#x51FD;&#x6570;&#x7684;&#x4F5C;&#x7528;&#x662F;&#xFF0C;&#x5C06;<code>Promise</code>&#x5B9E;&#x4F8B;&#x7684;&#x72B6;&#x6001;&#x4ECE;&#x201C;&#x672A;&#x5B8C;&#x6210;&#x201D;&#x53D8;&#x4E3A;&#x201C;&#x6210;&#x529F;&#x201D;&#xFF08;&#x5373;&#x4ECE;<code>pending</code>&#x53D8;&#x4E3A;<code>fulfilled</code>&#xFF09;&#xFF0C;&#x5728;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x6210;&#x529F;&#x65F6;&#x8C03;&#x7528;&#xFF0C;&#x5E76;&#x5C06;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x7684;&#x7ED3;&#x679C;&#xFF0C;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x4F20;&#x9012;&#x51FA;&#x53BB;&#x3002;<code>reject</code>&#x51FD;&#x6570;&#x7684;&#x4F5C;&#x7528;&#x662F;&#xFF0C;&#x5C06;<code>Promise</code>&#x5B9E;&#x4F8B;&#x7684;&#x72B6;&#x6001;&#x4ECE;&#x201C;&#x672A;&#x5B8C;&#x6210;&#x201D;&#x53D8;&#x4E3A;&#x201C;&#x5931;&#x8D25;&#x201D;&#xFF08;&#x5373;&#x4ECE;<code>pending</code>&#x53D8;&#x4E3A;<code>rejected</code>&#xFF09;&#xFF0C;&#x5728;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5931;&#x8D25;&#x65F6;&#x8C03;&#x7528;&#xFF0C;&#x5E76;&#x5C06;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x62A5;&#x51FA;&#x7684;&#x9519;&#x8BEF;&#xFF0C;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x4F20;&#x9012;&#x51FA;&#x53BB;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">timeout</span>(<span class="hljs-params">ms</span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>((resolve, reject) =&gt; {
    setTimeout(resolve, ms, <span class="hljs-string">&apos;done&apos;</span>);
  });
}

timeout(<span class="hljs-number">100</span>)
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>timeout(100)</code>&#x8FD4;&#x56DE;&#x4E00;&#x4E2A; Promise &#x5B9E;&#x4F8B;&#x3002;100&#x6BEB;&#x79D2;&#x4EE5;&#x540E;&#xFF0C;&#x8BE5;&#x5B9E;&#x4F8B;&#x7684;&#x72B6;&#x6001;&#x4F1A;&#x53D8;&#x4E3A;<code>fulfilled</code>&#x3002;</p>
<h2 id="promiseprototypethen">Promise.prototype.then()</h2>
<p>Promise &#x5B9E;&#x4F8B;&#x7684;<code>then</code>&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x6765;&#x6DFB;&#x52A0;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<p><code>then</code>&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x7B2C;&#x4E00;&#x4E2A;&#x662F;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x6210;&#x529F;&#x65F6;&#xFF08;&#x53D8;&#x4E3A;<code>fulfilled</code>&#x72B6;&#x6001;&#xFF09;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x7B2C;&#x4E8C;&#x4E2A;&#x662F;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x5931;&#x8D25;&#xFF08;&#x53D8;&#x4E3A;<code>rejected</code>&#xFF09;&#x65F6;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF08;&#x8BE5;&#x53C2;&#x6570;&#x53EF;&#x4EE5;&#x7701;&#x7565;&#xFF09;&#x3002;&#x4E00;&#x65E6;&#x72B6;&#x6001;&#x6539;&#x53D8;&#xFF0C;&#x5C31;&#x8C03;&#x7528;&#x76F8;&#x5E94;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> p1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">resolve, reject</span>) </span>{
  resolve(<span class="hljs-string">&apos;&#x6210;&#x529F;&apos;</span>);
});
p1.then(<span class="hljs-built_in">console</span>.log, <span class="hljs-built_in">console</span>.error);
<span class="hljs-comment">// &quot;&#x6210;&#x529F;&quot;</span>

<span class="hljs-keyword">var</span> p2 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">resolve, reject</span>) </span>{
  reject(<span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>(<span class="hljs-string">&apos;&#x5931;&#x8D25;&apos;</span>));
});
p2.then(<span class="hljs-built_in">console</span>.log, <span class="hljs-built_in">console</span>.error);
<span class="hljs-comment">// Error: &#x5931;&#x8D25;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>p1</code>&#x548C;<code>p2</code>&#x90FD;&#x662F;Promise &#x5B9E;&#x4F8B;&#xFF0C;&#x5B83;&#x4EEC;&#x7684;<code>then</code>&#x65B9;&#x6CD5;&#x7ED1;&#x5B9A;&#x4E24;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF1A;&#x6210;&#x529F;&#x65F6;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;<code>console.log</code>&#xFF0C;&#x5931;&#x8D25;&#x65F6;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;<code>console.error</code>&#xFF08;&#x53EF;&#x4EE5;&#x7701;&#x7565;&#xFF09;&#x3002;<code>p1</code>&#x7684;&#x72B6;&#x6001;&#x53D8;&#x4E3A;&#x6210;&#x529F;&#xFF0C;<code>p2</code>&#x7684;&#x72B6;&#x6001;&#x53D8;&#x4E3A;&#x5931;&#x8D25;&#xFF0C;&#x5BF9;&#x5E94;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4F1A;&#x6536;&#x5230;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x4F20;&#x56DE;&#x7684;&#x503C;&#xFF0C;&#x7136;&#x540E;&#x5728;&#x63A7;&#x5236;&#x53F0;&#x8F93;&#x51FA;&#x3002;</p>
<p><code>then</code>&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x94FE;&#x5F0F;&#x4F7F;&#x7528;&#x3002;</p>
<pre><code class="lang-javascript">p1
  .then(step1)
  .then(step2)
  .then(step3)
  .then(
    <span class="hljs-built_in">console</span>.log,
    <span class="hljs-built_in">console</span>.error
  );
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>p1</code>&#x540E;&#x9762;&#x6709;&#x56DB;&#x4E2A;<code>then</code>&#xFF0C;&#x610F;&#x5473;&#x4F9D;&#x6B21;&#x6709;&#x56DB;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;&#x53EA;&#x8981;&#x524D;&#x4E00;&#x6B65;&#x7684;&#x72B6;&#x6001;&#x53D8;&#x4E3A;<code>fulfilled</code>&#xFF0C;&#x5C31;&#x4F1A;&#x4F9D;&#x6B21;&#x6267;&#x884C;&#x7D27;&#x8DDF;&#x5728;&#x540E;&#x9762;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x6700;&#x540E;&#x4E00;&#x4E2A;<code>then</code>&#x65B9;&#x6CD5;&#xFF0C;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x662F;<code>console.log</code>&#x548C;<code>console.error</code>&#xFF0C;&#x7528;&#x6CD5;&#x4E0A;&#x6709;&#x4E00;&#x70B9;&#x91CD;&#x8981;&#x7684;&#x533A;&#x522B;&#x3002;<code>console.log</code>&#x53EA;&#x663E;&#x793A;<code>step3</code>&#x7684;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x800C;<code>console.error</code>&#x53EF;&#x4EE5;&#x663E;&#x793A;<code>p1</code>&#x3001;<code>step1</code>&#x3001;<code>step2</code>&#x3001;<code>step3</code>&#x4E4B;&#x4E2D;&#x4EFB;&#x610F;&#x4E00;&#x4E2A;&#x53D1;&#x751F;&#x7684;&#x9519;&#x8BEF;&#x3002;&#x4E3E;&#x4F8B;&#x6765;&#x8BF4;&#xFF0C;&#x5982;&#x679C;<code>step1</code>&#x7684;&#x72B6;&#x6001;&#x53D8;&#x4E3A;<code>rejected</code>&#xFF0C;&#x90A3;&#x4E48;<code>step2</code>&#x548C;<code>step3</code>&#x90FD;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&#x4E86;&#xFF08;&#x56E0;&#x4E3A;&#x5B83;&#x4EEC;&#x662F;<code>resolved</code>&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF09;&#x3002;Promise &#x5F00;&#x59CB;&#x5BFB;&#x627E;&#xFF0C;&#x63A5;&#x4E0B;&#x6765;&#x7B2C;&#x4E00;&#x4E2A;&#x4E3A;<code>rejected</code>&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x5728;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x662F;<code>console.error</code>&#x3002;&#x8FD9;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;Promise &#x5BF9;&#x8C61;&#x7684;&#x62A5;&#x9519;&#x5177;&#x6709;&#x4F20;&#x9012;&#x6027;&#x3002;</p>
<h2 id="then-&#x7528;&#x6CD5;&#x8FA8;&#x6790;">then() &#x7528;&#x6CD5;&#x8FA8;&#x6790;</h2>
<p>Promise &#x7684;&#x7528;&#x6CD5;&#xFF0C;&#x7B80;&#x5355;&#x8BF4;&#x5C31;&#x662F;&#x4E00;&#x53E5;&#x8BDD;&#xFF1A;&#x4F7F;&#x7528;<code>then</code>&#x65B9;&#x6CD5;&#x6DFB;&#x52A0;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x4E0D;&#x540C;&#x7684;&#x5199;&#x6CD5;&#x6709;&#x4E00;&#x4E9B;&#x7EC6;&#x5FAE;&#x7684;&#x5DEE;&#x522B;&#xFF0C;&#x8BF7;&#x770B;&#x4E0B;&#x9762;&#x56DB;&#x79CD;&#x5199;&#x6CD5;&#xFF0C;&#x5B83;&#x4EEC;&#x7684;&#x5DEE;&#x522B;&#x5728;&#x54EA;&#x91CC;&#xFF1F;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E00;</span>
f1().then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">return</span> f2();
});

<span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E8C;</span>
f1().then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  f2();
});

<span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E09;</span>
f1().then(f2());

<span class="hljs-comment">// &#x5199;&#x6CD5;&#x56DB;</span>
f1().then(f2);
</code></pre>
<p>&#x4E3A;&#x4E86;&#x4FBF;&#x4E8E;&#x8BB2;&#x89E3;&#xFF0C;&#x4E0B;&#x9762;&#x8FD9;&#x56DB;&#x79CD;&#x5199;&#x6CD5;&#x90FD;&#x518D;&#x7528;<code>then</code>&#x65B9;&#x6CD5;&#x63A5;&#x4E00;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;<code>f3</code>&#x3002;&#x5199;&#x6CD5;&#x4E00;&#x7684;<code>f3</code>&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x662F;<code>f2</code>&#x51FD;&#x6570;&#x7684;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x3002;</p>
<pre><code class="lang-javascript">f1().then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">return</span> f2();
}).then(f3);
</code></pre>
<p>&#x5199;&#x6CD5;&#x4E8C;&#x7684;<code>f3</code>&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x662F;<code>undefined</code>&#x3002;</p>
<pre><code class="lang-javascript">f1().then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  f2();
  <span class="hljs-keyword">return</span>;
}).then(f3);
</code></pre>
<p>&#x5199;&#x6CD5;&#x4E09;&#x7684;<code>f3</code>&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x662F;<code>f2</code>&#x51FD;&#x6570;&#x8FD4;&#x56DE;&#x7684;&#x51FD;&#x6570;&#x7684;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x3002;</p>
<pre><code class="lang-javascript">f1().then(f2())
  .then(f3);
</code></pre>
<p>&#x5199;&#x6CD5;&#x56DB;&#x4E0E;&#x5199;&#x6CD5;&#x4E00;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x5DEE;&#x522B;&#xFF0C;&#x90A3;&#x5C31;&#x662F;<code>f2</code>&#x4F1A;&#x63A5;&#x6536;&#x5230;<code>f1()</code>&#x8FD4;&#x56DE;&#x7684;&#x7ED3;&#x679C;&#x3002;</p>
<pre><code class="lang-javascript">f1().then(f2)
  .then(f3);
</code></pre>
<h2 id="&#x5B9E;&#x4F8B;&#xFF1A;&#x56FE;&#x7247;&#x52A0;&#x8F7D;">&#x5B9E;&#x4F8B;&#xFF1A;&#x56FE;&#x7247;&#x52A0;&#x8F7D;</h2>
<p>&#x4E0B;&#x9762;&#x662F;&#x4F7F;&#x7528; Promise &#x5B8C;&#x6210;&#x56FE;&#x7247;&#x7684;&#x52A0;&#x8F7D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> preloadImage = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">path</span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">resolve, reject</span>) </span>{
    <span class="hljs-keyword">var</span> image = <span class="hljs-keyword">new</span> Image();
    image.onload  = resolve;
    image.onerror = reject;
    image.src = path;
  });
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>image</code>&#x662F;&#x4E00;&#x4E2A;&#x56FE;&#x7247;&#x5BF9;&#x8C61;&#x7684;&#x5B9E;&#x4F8B;&#x3002;&#x5B83;&#x6709;&#x4E24;&#x4E2A;&#x4E8B;&#x4EF6;&#x76D1;&#x542C;&#x5C5E;&#x6027;&#xFF0C;<code>onload</code>&#x5C5E;&#x6027;&#x5728;&#x56FE;&#x7247;&#x52A0;&#x8F7D;&#x6210;&#x529F;&#x540E;&#x8C03;&#x7528;&#xFF0C;<code>onerror</code>&#x5C5E;&#x6027;&#x5728;&#x52A0;&#x8F7D;&#x5931;&#x8D25;&#x8C03;&#x7528;&#x3002;</p>
<p>&#x4E0A;&#x9762;&#x7684;<code>preloadImage()</code>&#x51FD;&#x6570;&#x7528;&#x6CD5;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code class="lang-javascript">preloadImage(<span class="hljs-string">&apos;https://example.com/my.jpg&apos;</span>)
  .then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{ <span class="hljs-built_in">document</span>.body.append(e.target) })
  .then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{ <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x52A0;&#x8F7D;&#x6210;&#x529F;&apos;</span>) })
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x56FE;&#x7247;&#x52A0;&#x8F7D;&#x6210;&#x529F;&#x4EE5;&#x540E;&#xFF0C;<code>onload</code>&#x5C5E;&#x6027;&#x4F1A;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#xFF0C;&#x56E0;&#x6B64;&#x7B2C;&#x4E00;&#x4E2A;<code>then()</code>&#x65B9;&#x6CD5;&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x4F1A;&#x63A5;&#x6536;&#x5230;&#x8FD9;&#x4E2A;&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#x3002;&#x8BE5;&#x5BF9;&#x8C61;&#x7684;<code>target</code>&#x5C5E;&#x6027;&#x5C31;&#x662F;&#x56FE;&#x7247;&#x52A0;&#x8F7D;&#x540E;&#x751F;&#x6210;&#x7684; DOM &#x8282;&#x70B9;&#x3002;</p>
<h2 id="&#x5C0F;&#x7ED3;">&#x5C0F;&#x7ED3;</h2>
<p>Promise &#x7684;&#x4F18;&#x70B9;&#x5728;&#x4E8E;&#xFF0C;&#x8BA9;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x53D8;&#x6210;&#x4E86;&#x89C4;&#x8303;&#x7684;&#x94FE;&#x5F0F;&#x5199;&#x6CD5;&#xFF0C;&#x7A0B;&#x5E8F;&#x6D41;&#x7A0B;&#x53EF;&#x4EE5;&#x770B;&#x5F97;&#x5F88;&#x6E05;&#x695A;&#x3002;&#x5B83;&#x6709;&#x4E00;&#x6574;&#x5957;&#x63A5;&#x53E3;&#xFF0C;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x8BB8;&#x591A;&#x5F3A;&#x5927;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x6BD4;&#x5982;&#x540C;&#x65F6;&#x6267;&#x884C;&#x591A;&#x4E2A;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#xFF0C;&#x7B49;&#x5230;&#x5B83;&#x4EEC;&#x7684;&#x72B6;&#x6001;&#x90FD;&#x6539;&#x53D8;&#x4EE5;&#x540E;&#xFF0C;&#x518D;&#x6267;&#x884C;&#x4E00;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF1B;&#x518D;&#x6BD4;&#x5982;&#xFF0C;&#x4E3A;&#x591A;&#x4E2A;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4E2D;&#x629B;&#x51FA;&#x7684;&#x9519;&#x8BEF;&#xFF0C;&#x7EDF;&#x4E00;&#x6307;&#x5B9A;&#x5904;&#x7406;&#x65B9;&#x6CD5;&#x7B49;&#x7B49;&#x3002;</p>
<p>&#x800C;&#x4E14;&#xFF0C;Promise &#x8FD8;&#x6709;&#x4E00;&#x4E2A;&#x4F20;&#x7EDF;&#x5199;&#x6CD5;&#x6CA1;&#x6709;&#x7684;&#x597D;&#x5904;&#xFF1A;&#x5B83;&#x7684;&#x72B6;&#x6001;&#x4E00;&#x65E6;&#x6539;&#x53D8;&#xFF0C;&#x65E0;&#x8BBA;&#x4F55;&#x65F6;&#x67E5;&#x8BE2;&#xFF0C;&#x90FD;&#x80FD;&#x5F97;&#x5230;&#x8FD9;&#x4E2A;&#x72B6;&#x6001;&#x3002;&#x8FD9;&#x610F;&#x5473;&#x7740;&#xFF0C;&#x65E0;&#x8BBA;&#x4F55;&#x65F6;&#x4E3A; Promise &#x5B9E;&#x4F8B;&#x6DFB;&#x52A0;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x90FD;&#x80FD;&#x6B63;&#x786E;&#x6267;&#x884C;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x4F60;&#x4E0D;&#x7528;&#x62C5;&#x5FC3;&#x662F;&#x5426;&#x9519;&#x8FC7;&#x4E86;&#x67D0;&#x4E2A;&#x4E8B;&#x4EF6;&#x6216;&#x4FE1;&#x53F7;&#x3002;&#x5982;&#x679C;&#x662F;&#x4F20;&#x7EDF;&#x5199;&#x6CD5;&#xFF0C;&#x901A;&#x8FC7;&#x76D1;&#x542C;&#x4E8B;&#x4EF6;&#x6765;&#x6267;&#x884C;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#xFF0C;&#x4E00;&#x65E6;&#x9519;&#x8FC7;&#x4E86;&#x4E8B;&#x4EF6;&#xFF0C;&#x518D;&#x6DFB;&#x52A0;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x662F;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&#x7684;&#x3002;</p>
<p>Promise &#x7684;&#x7F3A;&#x70B9;&#x662F;&#xFF0C;&#x7F16;&#x5199;&#x7684;&#x96BE;&#x5EA6;&#x6BD4;&#x4F20;&#x7EDF;&#x5199;&#x6CD5;&#x9AD8;&#xFF0C;&#x800C;&#x4E14;&#x9605;&#x8BFB;&#x4EE3;&#x7801;&#x4E5F;&#x4E0D;&#x662F;&#x4E00;&#x773C;&#x53EF;&#x4EE5;&#x770B;&#x61C2;&#x3002;&#x4F60;&#x53EA;&#x4F1A;&#x770B;&#x5230;&#x4E00;&#x5806;<code>then</code>&#xFF0C;&#x5FC5;&#x987B;&#x81EA;&#x5DF1;&#x5728;<code>then</code>&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x91CC;&#x9762;&#x7406;&#x6E05;&#x903B;&#x8F91;&#x3002;</p>
<h2 id="&#x5FAE;&#x4EFB;&#x52A1;">&#x5FAE;&#x4EFB;&#x52A1;</h2>
<p>Promise &#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x5C5E;&#x4E8E;&#x5F02;&#x6B65;&#x4EFB;&#x52A1;&#xFF0C;&#x4F1A;&#x5728;&#x540C;&#x6B65;&#x4EFB;&#x52A1;&#x4E4B;&#x540E;&#x6267;&#x884C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">resolve, reject</span>) </span>{
  resolve(<span class="hljs-number">1</span>);
}).then(<span class="hljs-built_in">console</span>.log);

<span class="hljs-built_in">console</span>.log(<span class="hljs-number">2</span>);
<span class="hljs-comment">// 2</span>
<span class="hljs-comment">// 1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4F1A;&#x5148;&#x8F93;&#x51FA;2&#xFF0C;&#x518D;&#x8F93;&#x51FA;1&#x3002;&#x56E0;&#x4E3A;<code>console.log(2)</code>&#x662F;&#x540C;&#x6B65;&#x4EFB;&#x52A1;&#xFF0C;&#x800C;<code>then</code>&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x5C5E;&#x4E8E;&#x5F02;&#x6B65;&#x4EFB;&#x52A1;&#xFF0C;&#x4E00;&#x5B9A;&#x665A;&#x4E8E;&#x540C;&#x6B65;&#x4EFB;&#x52A1;&#x6267;&#x884C;&#x3002;</p>
<p>&#x4F46;&#x662F;&#xFF0C;Promise &#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x4E0D;&#x662F;&#x6B63;&#x5E38;&#x7684;&#x5F02;&#x6B65;&#x4EFB;&#x52A1;&#xFF0C;&#x800C;&#x662F;&#x5FAE;&#x4EFB;&#x52A1;&#xFF08;microtask&#xFF09;&#x3002;&#x5B83;&#x4EEC;&#x7684;&#x533A;&#x522B;&#x5728;&#x4E8E;&#xFF0C;&#x6B63;&#x5E38;&#x4EFB;&#x52A1;&#x8FFD;&#x52A0;&#x5230;&#x4E0B;&#x4E00;&#x8F6E;&#x4E8B;&#x4EF6;&#x5FAA;&#x73AF;&#xFF0C;&#x5FAE;&#x4EFB;&#x52A1;&#x8FFD;&#x52A0;&#x5230;&#x672C;&#x8F6E;&#x4E8B;&#x4EF6;&#x5FAA;&#x73AF;&#x3002;&#x8FD9;&#x610F;&#x5473;&#x7740;&#xFF0C;&#x5FAE;&#x4EFB;&#x52A1;&#x7684;&#x6267;&#x884C;&#x65F6;&#x95F4;&#x4E00;&#x5B9A;&#x65E9;&#x4E8E;&#x6B63;&#x5E38;&#x4EFB;&#x52A1;&#x3002;</p>
<pre><code class="lang-javascript">setTimeout(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-number">1</span>);
}, <span class="hljs-number">0</span>);

<span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">resolve, reject</span>) </span>{
  resolve(<span class="hljs-number">2</span>);
}).then(<span class="hljs-built_in">console</span>.log);

<span class="hljs-built_in">console</span>.log(<span class="hljs-number">3</span>);
<span class="hljs-comment">// 3</span>
<span class="hljs-comment">// 2</span>
<span class="hljs-comment">// 1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x8F93;&#x51FA;&#x7ED3;&#x679C;&#x662F;<code>321</code>&#x3002;&#x8FD9;&#x8BF4;&#x660E;<code>then</code>&#x7684;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x7684;&#x6267;&#x884C;&#x65F6;&#x95F4;&#xFF0C;&#x65E9;&#x4E8E;<code>setTimeout(fn, 0)</code>&#x3002;&#x56E0;&#x4E3A;<code>then</code>&#x662F;&#x672C;&#x8F6E;&#x4E8B;&#x4EF6;&#x5FAA;&#x73AF;&#x6267;&#x884C;&#xFF0C;<code>setTimeout(fn, 0)</code>&#x5728;&#x4E0B;&#x4E00;&#x8F6E;&#x4E8B;&#x4EF6;&#x5FAA;&#x73AF;&#x5F00;&#x59CB;&#x65F6;&#x6267;&#x884C;&#x3002;</p>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>Sebastian Porto, <a href="http://sporto.github.com/blog/2012/12/09/callbacks-listeners-promises/" target="_blank" rel="nofollow">Asynchronous JS: Callbacks, Listeners, Control Flow Libs and Promises</a></li>
<li>Rhys Brett-Bowen, <a href="http://modernjavascript.blogspot.com/2013/08/promisesa-understanding-by-doing.html" target="_blank" rel="nofollow">Promises/A+ - understanding the spec through implementation</a></li>
<li>Matt Podwysocki, Amanda Silver, <a href="http://blogs.msdn.com/b/ie/archive/2011/09/11/asynchronous-programming-in-javascript-with-promises.aspx" target="_blank" rel="nofollow">Asynchronous Programming in JavaScript with &#x201C;Promises&#x201D;</a></li>
<li>Marc Harter, <a href="https://gist.github.com//wavded/5692344" target="_blank" rel="nofollow">Promise A+ Implementation</a></li>
<li>Bryan Klimt, <a href="http://blog.parse.com/2013/01/29/whats-so-great-about-javascript-promises/" target="_blank" rel="nofollow">What&#x2019;s so great about JavaScript Promises?</a></li>
<li>Jake Archibald, <a href="http://www.html5rocks.com/en/tutorials/es6/promises/" target="_blank" rel="nofollow">JavaScript Promises There and back again</a></li>
<li>Mikito Takada, <a href="http://book.mixu.net/node/ch7.html" target="_blank" rel="nofollow">7. Control flow, Mixu&apos;s Node book</a></li>
</ul>




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